Series regulator upgrade, SH775 or SH847 - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 300 Old 10-09-2016, 10:49 AM Thread Starter
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Series regulator upgrade, SH775 or SH847

Getting ready to order the parts while my stator is still good. There are two options, the 775 at 35 amps and the 847 at 50 amps. The 2013 650 has a 400 watt stator so the 775 is well within its range and much easier to mount in the stock location than the bigger 847. My bike is converted to all LED which drastically decreases the current needed to run the bike. Will this decrease in current have any affect on the total load placed on the regulator at high RPM interstate running? I have no issue going either route, I just don't ever want to mess with it again. Is the any benefit to going with the 847 in my case or will the 775 be fine.

"Dave"
2013 DL650A V-Strom Adventure
If You're Gonna Be Stupid, You Better Be Hard!

2016 GL1800 Goldwing, Matte silver and black, my retirement ride, will do 49 states.
2013 V Strom DL650 Adventure AKA Max, Fun, different, did I say fun? (traded)
2004 FLHTC Ole Red, all lower 48, several times (sold 180k miles did lower 48 four times)
1999 FXST Stage 4 Evo AKA Bitch Bike and holeshot king
1998 FXDWG Red Grey (sold)
1997 XL (Mom's bike)
1976 XLCH Iron Head (Leaker)
1978 ZIR TC (AKA Smoky) Rated "R" not for kids under 17 (Seized by father)
1976 CB 750 (AKA trouble)
1976 MT 250 Elsinore (My favorite, rode the country on a 2 stroke)
1974 CB 350-F4 (AKA Dog)
1974 Kawi 100E (AKA Sparky the mud bug)
1972 KV 75 kawi
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post #2 of 300 Old 10-09-2016, 11:07 AM
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The 847 is overkill. The question is whether you like overkill and will the price difference be important to you. Both are series types so a lower draw will not hurt anything, unlike with a shunt type.
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post #3 of 300 Old 10-09-2016, 11:12 AM
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In the same shoes and went with SH775. From what greywolf is saying there are no reports of sh775 failure on 'strom. Also Polaris uses it on rangers with 500wt stator.

Glee seems to have RR mounted in good spot stopping in traffic will kick radiator fan and keep airflow across.. stock stator is rated at 27A? SH775 needs 1-2mph to handle that.

However SH847 is only $80 more, it is worth it if you may upgrade to higher output stator down the road. I have considered and decided that I won't, because 1) there's enough overhead due to LED conversion, 2) stock stator puts out more in 2-3k range and I spend alot of time there. Your situation may be different though.
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post #4 of 300 Old 10-09-2016, 11:18 AM
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post #5 of 300 Old 10-09-2016, 11:31 AM
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Quote:
Originally Posted by DaveinNC View Post
Getting ready to order the parts while my stator is still good. There are two options, the 775 at 35 amps and the 847 at 50 amps. The 2013 650 has a 400 watt stator so the 775 is well within its range and much easier to mount in the stock location than the bigger 847. My bike is converted to all LED which drastically decreases the current needed to run the bike. Will this decrease in current have any affect on the total load placed on the regulator at high RPM interstate running? I have no issue going either route, I just don't ever want to mess with it again. Is the any benefit to going with the 847 in my case or will the 775 be fine.
Under the conditions you state, I don't think there is any reason at all to pay more for the higher ampacity regulator and increase the mounting hassle.

On my 2013 DL-650, I have all lights except turn signals converted to LED and the SH775 heatsink does not even become uncomfortable to touch. The semiconductors cooled by that heatsink have an easy life. (I say this with some authority, as an electrical engineer.)

The current drawn by the regulator, expressed in average terms, is essentially unchanged at any RPM where the stator can supply the demanded load. And for the switching devices used in the series R/R, (a regenerative, 4-layer device), voltage drop is approximately constant so dissipation is dependent only on average current. To the extent that drop is not constant, the dissipation change with RPM is negligible due to the way stator inductive reactance serves to keep switch duty cycle close to constant across RPM for any given load current.

To mount my SH775, I just sawed a slot meeting the mounting hole at one end. With a largish washer under the bolt head there, it is perfectly secure. (And the washer hides the slot!)
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post #6 of 300 Old 10-09-2016, 01:08 PM
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Quote:
Originally Posted by Trepidator View Post
Under the conditions you state, I don't think there is any reason at all to pay more for the higher ampacity regulator and increase the mounting hassle.

On my 2013 DL-650, I have all lights except turn signals converted to LED and the SH775 heatsink does not even become uncomfortable to touch. The semiconductors cooled by that heatsink have an easy life. (I say this with some authority, as an electrical engineer.)

The current drawn by the regulator, expressed in average terms, is essentially unchanged at any RPM where the stator can supply the demanded load. And for the switching devices used in the series R/R, (a regenerative, 4-layer device), voltage drop is approximately constant so dissipation is dependent only on average current. To the extent that drop is not constant, the dissipation change with RPM is negligible due to the way stator inductive reactance serves to keep switch duty cycle close to constant across RPM for any given load current.

To mount my SH775, I just sawed a slot meeting the mounting hole at one end. With a largish washer under the bolt head there, it is perfectly secure. (And the washer hides the slot!)


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post #7 of 300 Old 10-09-2016, 02:55 PM Thread Starter
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Thank you to all that replied. The 775 it will be. I'm all for easy mounting and saving money. With the 775 I can also keep my neat little cover that comes with the OEM power port. Thanks Y'all.
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"Dave"
2013 DL650A V-Strom Adventure
If You're Gonna Be Stupid, You Better Be Hard!

2016 GL1800 Goldwing, Matte silver and black, my retirement ride, will do 49 states.
2013 V Strom DL650 Adventure AKA Max, Fun, different, did I say fun? (traded)
2004 FLHTC Ole Red, all lower 48, several times (sold 180k miles did lower 48 four times)
1999 FXST Stage 4 Evo AKA Bitch Bike and holeshot king
1998 FXDWG Red Grey (sold)
1997 XL (Mom's bike)
1976 XLCH Iron Head (Leaker)
1978 ZIR TC (AKA Smoky) Rated "R" not for kids under 17 (Seized by father)
1976 CB 750 (AKA trouble)
1976 MT 250 Elsinore (My favorite, rode the country on a 2 stroke)
1974 CB 350-F4 (AKA Dog)
1974 Kawi 100E (AKA Sparky the mud bug)
1972 KV 75 kawi
1970 Rupp mini bike
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post #8 of 300 Old 10-09-2016, 08:04 PM
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You gonna do pics and a write up Dave?
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post #9 of 300 Old 10-09-2016, 09:27 PM
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Question

Where would be the best place to purchase the SH775?
Thanks


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post #10 of 300 Old 10-09-2016, 11:30 PM
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Quote:
Originally Posted by senoje View Post
Picture this, then: Imagine a milling tool the same diameter as one mounting hole, placed in the hole, turned by a milling machine, then moved along the shortest path to the nearest edge. For those without a milling machine, the slot so formed can be more conveniently formed with two saw cuts, each tangent to an edge of the original hole and perpendicular to the nearest edge. The result is a 'U' shaped slot. (That 'U' is pictorial, not phonetic.)

As for "WORTHLESS" (bouncing or still), the need for and proper location of the slot is obvious as soon as the SH-775 is placed next to the threaded mounting holes on the bike. At that point, knowing that the regulator tolerates having its heatsink sawed and that slotting one edge results in secure mounting is worthwhile. I should add a fact hard to discern from a picture alone: The heatsink is aluminum and it is relatively easy to cut with a sharp hand saw.
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